A set up question of Let's Encrypt

[k356g]

I try to set up Let's Encrypt on my opnsense, and follow below video step by step.
https://www.youtube.com/watch?v=IR41duTqN6Y

But I have a question below:
How to set up the "Services -> Let's Encrypt -> Certificates-> Common Name"

Please help me. Thank you.

[marjohn56]

Common name is the name of the host such as mail.mydomain.com, or you can do as I have done and do *.mydomain.com, thus making it a wildcard. I then import the certificates automagically into my webserver etc and they work fine.